A representative of FTDNA says that the price of the combined 37 marker Y-DNA test and the Family
Finder Test is $438 regardless of whether done via a Surname Group or not. It is the price to all comers. Still, it is strange that they show two different prices on their website without explanation, one at $458 and one at $438 for the exact same combination of tests.
They may have lowered the price to stimulate growth of the genetic data base. The data base needs to grow quickly to encourage more people to sign up for the test.